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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aa1b0434d07fbb821bf209c9752daf9d761bc5d1a90e8549208ed4a937ddc2d' 
  AND token = 'Pfq3idp9y8sTYZjwb4R789pAkHFpHExWWCBt0zgJoqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}